The Structural Design And Simulation Research Of A Single Screw Extruder In Axial Vibration

Extruder is one of the main equipment in the polymer molding field. With the invention of the screw vibration extruder, extruded product quality was greatly improved, length of the screw was well shortened, design and manufacture difficulty of the screw was obviously reduced, and cost as well as size of the extruder was dramatically decreased. Through analysis of the development of vibration extrusion technology at home and abroad, using a new mechanical vibration type, and with a special idea of structure design and energy saving, this article put forward a new mechanical vibration extruder, which was a new technology and a new equipment in the polymer molding field. And then in-depth theoretical research and computer simulation analysis was conducted.Firstly, working principle of the new screw vibration extruder was expounded, and mathematical equations of the undulant surface of vibration excitation were built up based on the theories of enveloping surface and coordinate rotation transformation, as well as given cosinusoidal motion. Also, pressure angle and radius of curvature of the undulant surface was deduced out, which was a basis for detailed design of the undulant surface as well as a basis for later mechanical analysis.Secondly, the article analyzed vibration performance of the screw and static force characteristics of the key vibration excitation parts two aspects—Dynamics and Statics. First, the vibration model of the extruder was established, and key parameters were theoretically deduced. Then using the ADMAS software, simulation verifications of the vibration performance of the screw was conducted. Second, force analysis for the roller and undulant surface was done, and static equilibrium equations were established. Using ANSYS Workbench, simulation analysis of mechanical property for rollers and contact characteristics for roller and undulant surface were implemented, and related static characteristic nephograms which are theoretical guidances for structural optimization of the key vibration parts were provided.Thirdly, energy saving property of the new vibration extruder was analyzed in two aspects, that when choosing different shape of rollers as well as choosing different heating modes for charging barrel. First, the thesis researched the energy saving differences between cylindrical roller and conical roller, which proved that the conical roller had smaller rolling friction energy consumption and better wear resistance, and this is also a theory support for the design of the undulant surface in the second chapter. Then heating principles and energy saving differences between electrical resistance heating method and electromagnetic induction heating method was contrastively analyzed, and electromagnetic-thermal coupling simulated analysis was conducted. The result showed that electromagnetic induction heating method had better energy saving property.Finally, the paper introduced the manufacturing plan of the vibration extruder as well as current work progress. Regrettably, due to that the processing of the equipment hasn’t yet finished, therefore experiment research of vbration extrusion characteristics was forced to delay.